Pressure-induced structural phase transition in rare-earth trihydrides. Part III. Systematics: General and geometric approach

Systematics of hcp–fcc phase transition observed in a series of lanthanide and yttrium trihydrides has been established. Based on the established systematics the prediction of the hcp–fcc transition pressure for the rest of the lanthanide trihydrides has been made. The role of H–H repulsive interaction as a probable transition promoter is discussed.